USB: descriptor handling

Hi,

I found a bug when working with the u-boot USB subsystem on IXP425 processor
(big endian Xscale aka ARMv5).
I recognized that the second usb_endpoint_descriptor of the attached memory
stick was corrupted.

The reason for this are the packed structures below (either u-boot and
u-boot-usb):

--------------
/* Endpoint descriptor */
struct usb_endpoint_descriptor {
	unsigned char  bLength;
	unsigned char  bDescriptorType;
	unsigned char  bEndpointAddress;
	unsigned char  bmAttributes;
	unsigned short wMaxPacketSize;
	unsigned char  bInterval;
	unsigned char  bRefresh;
	unsigned char  bSynchAddress;

} __attribute__ ((packed));
/* Interface descriptor */
struct usb_interface_descriptor {
	unsigned char  bLength;
	unsigned char  bDescriptorType;
	unsigned char  bInterfaceNumber;
	unsigned char  bAlternateSetting;
	unsigned char  bNumEndpoints;
	unsigned char  bInterfaceClass;
	unsigned char  bInterfaceSubClass;
	unsigned char  bInterfaceProtocol;
	unsigned char  iInterface;

	unsigned char  no_of_ep;
	unsigned char  num_altsetting;
	unsigned char  act_altsetting;
	struct usb_endpoint_descriptor ep_desc[USB_MAXENDPOINTS];
} __attribute__ ((packed));
------------

As usb_endpoint_descriptor is only 7byte in length, the start of all
odd ep_desc[] structures is not word aligned. This makes wMaxPacketSize
of these structures also not word aligned.

ARMv5 Architecture however does not support non-aligned multibyte
data type (see A2.8 of ARM Architecture Reference Manual).

Signed-off-by: Stefan Althoefer <stefan.althoefer@web.de>
Signed-off-by: Remy Böhmer <linux@bohmer.net>

diff --git a/include/usb.h b/include/usb.h
index 84a77b2f8ba155217b724b61e8b80626c943c594..510df95d628e887fc49eaf3b9c58367f254e43e0 100644 (file)
--- a/include/usb.h
+++ b/include/usb.h
@@ -91,7 +91,7 @@ struct usb_endpoint_descriptor {
        unsigned char   bInterval;
        unsigned char   bRefresh;
        unsigned char   bSynchAddress;
-} __attribute__ ((packed));
+} __attribute__ ((packed)) __attribute__ ((aligned(2)));
 
 /* Interface descriptor */
 struct usb_interface_descriptor {